• synonyms


noun Ophthalmology.
  1. the normal refractive condition of the eye, in which the rays of light are accurately focused on the retina.
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Origin of emmetropia

1860–65; < New Latin, equivalent to emmetr- (stem of Greek émmetros in measure, equivalent to em- em-2 + métr(on) measure + -os adj. suffix) + -opia -opia
Related formsem·me·trope, nounem·me·trop·ic [em-i-trop-ik, -troh-pik] /ˌɛm ɪˈtrɒp ɪk, -ˈtroʊ pɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for emmetropia

Historical Examples

  • Visual acuteness on both sides 5/12, the left slightly better than the right; emmetropia in mydriasis by atropine.

    Schweigger on Squint

    C. Schweigger

  • I have occasionally seen periodic accommodative squint with emmetropia of the fixing eye.

  • It may, therefore, be useful for our purpose to cite a few cases of periodic convergent strabismus with emmetropia.

  • Therefore we see the same form of squint arise less often in emmetropia (see Case 45) when childhood is past, than in myopia.

  • Those cases deserve special consideration in which emmetropia is present in one eye, in the other myopia.

British Dictionary definitions for emmetropia


  1. the normal condition of perfect vision, in which parallel light rays are focused on the retina without the need for accommodation
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Derived Formsemmetropic (ˌɛmɪˈtrɒpɪk), adjective

Word Origin

C19: from New Latin, from Greek emmetros in due measure + -opia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

emmetropia in Medicine


  1. The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.
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Related formsem′me•tropic (-trŏpĭk, -trōpĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.